Grinding machine



` July 4, 1933. Q BOOTH 1,916,917

GRINDING MACHINE Filed oct. 25, 1930 3 Sheets-sheet 1 nlm HW@ illl Il' lulululllullulmnl llllllllllllllllllllllllllllllll July 4, 1933.

Filed Oct. 25 1930 C. BOOTH GRINDING MACHINE 3 Sheets-Sheet 2 Bmw/Mm July 4, 1933. c. BOOTH 1,916,917

GRINDING MACHINE Filed Oct. 25 1950 3 Sheets-Sheet 3 1 Se, l

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Patented July 4, 1933 STPFES PATENT OFFHCE.

CLEllfENT BOGTI-, OF CINCINNAT, OHIO, ASSGNR, BY MIESNE ASSGNIVENTS, TO THE Y I-EALD MACHNE COMPANY, 0.?? TORGESTR, MASS CHUSETTS, A CGRPORATSON OF,

G-nnrnnvo Maonrnn Application filed October 25, 1930.

IThis invention relates to improvements in an' apparatus tor grinding and finishing and especially to improvements in a grinning 1nachine Jfor supporting9 rotating and grinding a wcrlr piece such as a bearing roll Jfor antifriction bearings and the like.

@ne of the principal objects oi the presont invention is the provision of a machine for accurately and expeditiously grinding the terminal portion of cylindrical parts such as bearing rolls for antitriction bearings or the like.

Another object of the invention is the provision ot a machine especially adapted for the grinding or forming of the terminus or seat portion of tapered antifriction rolls so that a series ot such rolls will have the r seat portion in a definite relation to the body portion thereof whereby the several rolls when mounted in a single bearing will bear the proper relation to one another and to the bearing race to properly distribute the bearing load and thereby increase-the lite and usefulness or" the bearing.

Another object of the present invention is the provision orn an improved machine for finishing, grinding and forming the terminal portion of taper antifriction bearing rolls normal to the axis of rotation of such tapered members. l

4Another object of the invention is the provision of improved means for supporting and rotating normally ditlicult to handle work pieces, such as tapered antifriction bearin@` rolls, without the use of chucls or the like and for presenting said work pieces while being so supported and rotated to the action of a cutting tool.

Other objects and advantages of the present invention should be readily apparent by reference to the following specification considered in conjunction with the accompanying drawings forming a. part thereof, and it is to be understood that any modifications may be made in the eact structural details there shown and described, within the scope of the appended claims. without departing from or exceeding the spirit oit the invention.

l ln the drawings :V

.Figure l is a front elevation of a grinding voii rotation ot such rolls.

Serial No. 491,123.

machine embodying the improvements of this invention.

Figure 2 is a top plan view of the machine shown in Figure 1.

Figure 3 is an enlarged Yfragmentary sectional view taken on line 3 3 of Figure l.

Figure 4 is a fragmentary sectional view of certain parts shown in Figure 3 but bearing a different relation to one another.

Figure 5 is a top plan view of a modified form of mechanism embodying the principles of the invention, certain parts of which are shown in cross section.

' Figure 6 is a sectional vie-w on line 6 6 of Figure 5.

Figure 7 is a developed sectional view on line 7 7 of Figure 6.

` Throughout hc several views of the drawings similar reference characters are employed to denote the same or similar parts.

rlhis invention tinds its principal use in grinding the terminal seat portion of tapered anti-friction bearing rolls normal to the axis The device, as shown in Figures 1 to et inclusive, may comprise a. bed 10 having a column 11 rising thercabove and to one side thereof. The column is provided with a dove-tailed guide 12, Fig. 2, received in a similarly formed guideway 13 provided in a carrier 14. An elevating screw 15 may be provided Jfor adjusting the carrier lll relative to the column 11 which may be operatively coupled with the hand wheel 167 FigQ, for actuation thereby. T he carrier 14 is provided with arms 17 'and 18 receiving therebetween a tang 19 extending from a motor housing 20. The arms 17 and 18 and the tang 19 are provided with bores in axial alignment with one ano-ther for an axle bolt or the like 21. Nuts 22 on one ond of aXle bolt 21 and the head 21a thereof cooperate with one another to secure the carrier and motor housing yin angular relation relative to one another for a purpose that will later appear. The motor housing 2O has extending from it a spindle 23, Fig. 1, to which is secured a grinding wheel 24 rotatable at a. high or grinding rate of speed by the motor 20.

Referring to Figs. 2 and 3, the upper portion of the table 10 has secured thereto a pair of similar bed plates 25 and 26, Fig. 3, each having formed therein a guideway 27 and 28 respectively receiving the dove-tailed tongues 29 and 30. The tongues 29 and 30 respectively, depend from slides 31 and 32 each being in turn provided with a dovetailed groove 33 and 34 receiving similarly formed tongues 35 and 36 depending from slides 37 and 38 super-imposed on the slides 31 and 32. Intermediate the plates 25 and 26 and carried by the bed 10 is a pressure or guide bar 39 having opposite faces 40 and 41 angled relative to one another and the said faces extend downwardly in opposite directions.

The angular or tapered faces 40 and 41 are respectively adjacent to and spaced from angular faces 42 and 43 formed respectively on the slides 35 and 36. The said faces 40 and 42 and. 41 and 43 form between them work receiving grooves having an include-d angle of the same degree as the work to be operated upon. By reference to Figure 3 it will be noted that the size or width of the work receiving grooves is such that the work after being positioned therein extends above the upper surface of the slides 35 and 36 and pressure bar 39 so that the grinding wheel 24 may act on the said projecting portion. The work is adapted to be actuated along the upper portion of the bed 10 through the work receiving grooves beneath the grinding wheel to have an operation performed thereon.

In practice one set of slides is being utilized to actuate or traverse the work relative to the grinding wheel while the other set or pair of slides is bein r returned from the unloading position to the loading position. For example, and as shown in the drawings, slides 31 and 37 are traveling to the left, as seen in Figures 1 and 2, for traversing the work pieces carried thereby relative tothe grinding wheel while the slides 32 and 38 are moving from the left, or unloading position, to the right to receive a series of unfinished work pieces, which latter are manually positioned Ain the work supportingl structure at the right end of the machine. For effecting this movement the slides 31 and 37 are each provided on their outward faces with rack teeth 45 and 46, Fig. 3, respectively meshing with gears 47 and 48 of compound gear 49. rlhe gears 47 and 48 are of an unequal number Vo f teeth, the former having one tooth more than'the latter whereby a slight differential movement is obtained between the slides 31 and 37 whereby slide 37 moves slightly faster than slide 31. Sli-de 31 has secured to it for movementtherewith work rest blades 50 which back upv the work to take the thrust of the grinding wheel on the work and to prevent Cantin@r or tilting thereof in the work throat. The differential movement between the slides results in a slightly slower movement of the blades 50 than the normal roll of the work as obtained through the opposed tapered faces 40 and 42 of the pressure bar 39 and slide 37 respectively.

As has been noted above, the angle of the faces 40 and 42 relative to one another is equal to the taper on the work whereby the work rolls on its prefinished surface about its normal axis and since the grinding wheel operates in a plane at right angles to the axis of the work the end or seat portion thereof is finished or ground normal to the said axis.

The slides 32 and 38 are likewise each provided with rack teeth 51 and 52 meshing with gears 53 and 54 of compound gear 55. The same relation between gears 53 and 54 exists as there is between gea-rs 47 and 48, so that the same differential of movement between the slides 32 and 38 is obtained.

The compound gear 49 is secured to a stud 56 rotatably journaled in the bed plate 25 and has secured thereto a bevel gear 57 meshwith a similar bevel gear 58 fast on driving shaft 59. rFhe compound gear 55 is similarly secured to a stud 60 iournaled in the bed plate 26 and has secured to its one end a bevel pinion 61 meshing with asimilar bevel gear 62 fast on the driving shaft 59. By reference to Figure 3 it will be noted that the slides 31 and 37 have their teeth formed on the sides thereof opposite to the .sides of the slides 32 and 38 on which their rack teeth are formed, so that rotation of the compound gears 49 and 55 in the same direction will reciprocate their respective slides in opposite directions whereby one set of slides is traversing the work against the action of the grinding wheel while the remaining set is being returned to the loading station.

The drivingshaft 59 is mounted in suitable bearings formed in the walls of the bed 10 and the said shaft 59 'has secured'to its forward end a gea-r 63 meshing with change gears or t-he like 64 which extend to a suitable initial driver or prime` mover for effecting a rotation of the shaft 59. A suitable housing or guard 65 may be provided for enclosing the gears 63-64 and the like.

rlhe foregoing description deals with the normal operation of the machine for producing fiat seats orv terminal portions on tapered work pieces which are at right angles to the aXis of rotationthereof. By adjusting the motor 20 and grinding wheel 24 about the axis of axle bolt 21 crowned or contoured terminal portions may be provided on the work. For this purpose the slide 37 is formed with a depression 66 to form' a clearance for the end of the wheel when itis tilted, as shown in Figure 4, in wnich position a crown, as there shown,rmay be formed on the wo"k or the seat. or terminus of the work may be contoured by removing the corner of the work and forming a flat portion between the body and the flat top surface of the work.

The structure shown in Figures 5, 6 and 7 is of a slightly diffe rent form in that instead of actuating the work pieces tangentially of the-wheelr the work is actuated in a circular path relative Vto the grinding wheel. For this purpose a. bed 67 is provided supporting a. stationary shaft 68 having secured to its upper end a plate (i9, the peripheral face 7 O of which is tapered or formed in accordanc-e with the taper or form of the work to be operated upon. y A stationary bearing portion 71 is carried by the bed 67 and has secure-d therein the stationary shaft 68. Supported by the bearing portion 71 is a rotatable member 7 2 having a flange 73 extending from one end thereof, in the periphery of which are formed gear teeth 7a meshing with a pinion 75 secured to one end of al shaft 76 journaled in a boss 77 carried by the bed G7. Secured to the other end of shaft 76 is a second pinion 78 meshing with an idler geai` 79 rotatably ournaled on the stationary shaft G8. The idler gear 7 9, in addition, meshes with. the teeth of a drive pinion 80 fast on a driving shaft 81 journaled in a second boss 81a carried by the bed 67. A pulley 82 is secured to the shaft 81 whereby mot-ion and power are transmitted to the said shaft.

The rotatable member 72 has extending above the flange 73 a circular body or bearing portion. 83 about which is encircled a work rotating or driving ring 84 having a flange 85 resting on the upper bearing surface of flange 73. The work rotating` ring 84 is provided on its upper end with a flange 86 in which are formed gear teeth 87 meshing with a pinion 88 fast on the upper end of drivev shaft 81. The work driving ring 84 extends above the upper limits of the rotating member 72 and has its inner edge 89 spaced from the tapered face 70 of plate 69 and the said inner edge 89 is tapered oppositely to the taper on face 70 and cooperates therewith to form a work receiving trough having an included angle corresponding to the work to be operated upon.

ln order to prevent the work pieces from tilting or canting` while in the work groove the said work is backed up by backing up members or blades 90 which are carried by the rotatable member 72. ln order to maintain a suilicient back pressure between the work and the backing up members or blades 90 the gears 87 and 74: are made of an unequal number of teeth whereby the gear 74 is driven at a slightly slower rate than the gear 87 so that the backing up members or blades 90 tend to hold the work against their natural roll as effected through the engagement of tapered face 70--89 therewith. ln other words a slight back pressure is maintained between the work and blades SO which prevents the work from tilting or canting in the work receiving trough and the work bladesv 90 take the thrust of the grinding` wheel during the grinding operation. The differential rotation of the member 7 2 and work rot-ating ring 84 is obtained, as noted above, through the unequal gears 7 a and 87 which gears are respectively driven by pinions 75 and 7 8 driven at the same rate of speed through the pulley 82 and interconnecting gears.

The work pieces may be dropped into the work receiving groove by any desirable means ahead ofthe backing up members or blades 90 and actuated relative to the grinding wheel to effect stock removal therefrom. In order to discharge the work pieces from the trough at the conclusion of the grinding operation the rotating member 72 is provided fith a plurality of apertures 91 therein, Fig.

7, each aperture being adjacent the work engaging face of the backing up members 90. An ejector piu 92 is ijirevided in each aperture 91 directly beneath each work piece and the lower end 93 of each pin rides on the upper surface 94 of cam track 95. The said track 95, as seen in Figure 6, is secured to the stationary bearing liortion 71 beneath the path of movement of the said pin and the track is provided with an inclined cam portion 96 whereby the said ejector pins are forced outwardly through the apertures 91 for effecting an ejection of the work from the work receiving trough, as best shown in 7. The cam portion 96 is positioned adjacent the operators station so that thel work may be readily withdrawn from the machine following` ection from the work receivingl trough and a new work piece inserted therein.

From the foregoing it will be noted that tapered bearingrolls or the like, may be eX- peditiously and accurately formed as to their seat portion, which is formed absolutely normal to the axis'thereof since the work is floated and rotated on the ultimate bearing face and the seat portion formed in accordance with and relative to the bearing thereof.

`What is claimed is:

1. ln a grinding machine of the class described, the combination of a bed, a grindwheel carried by the bedr a work receiving trough carried by the bed comprising a lined side secured to the bed and a movable side spaced from the lined side forming the work receiving trough therebetween in which the work is disposed in simultaneous engagement with the sides of the trough. means for actuating the movable side and rolling the 7ork on the hired side relativo to the grinding` wheel, andadditional means in the work receiving` trough laterally engaging the work to take the thrust of the grinding wheel, said last means being' movable to maintain engagement between said means and the work the latt r is rolled by the movable side.

2. In a grinding machine for grinding the terminal seat portion of tapered bearing rolls, the combination of a bed having a work supporting portion, a grinding wheel carried by the bed and rotatable in a horizontal plane above the work supporting portion, means for supporting and rotating taper rolls and laterally actuating same relative to the grinding wheel to effect stock removal therefrom comprising a fixed plate having a tapered face and al rotatable plate having a moving face opposed to the face of the fixed plate and forming a work receiving groove therebetween, and means in the work receiving groove for engagement with the work to take the'thrust of the grinding wheel.

3. In a grinding machine of the class described the combination of a bed having a work supporting portion, a. grinding wheel carried therebyand rotatable in a horizontal plane above the work supporting portion, a stationary bar carried by the bed beneath the plane of rotation of the grinning-wheel, a slide carried by thebed for movement relative thereto and spaced from the stationary bar to form a work receiving groove, the opposed faces of the'groove conforming to the contour of the work to be received thereby, means for translating the slide for effecting a rotation of the work about its axis through the frictional contact of the work and the slide, and means laterally engaging the work tol prevent tilting or canting of the work in the work receiving groove and to talre the thrust of the grinding wheel on the work.

4. Ina grinding machine of the class described the combination of a bed having a work supporting portion, a grinding wheel carried thereby and rotatable in a horizontal plane above the work supportingv portion, a stationary bar carried by the bed beneath the plane of rotation of the grinding wheel, a slide carried by the bed for movement relative thereto and spaced from the stationary bar to form a work receiving groove, the opposed faces of the Groove conforming to the contour of the work to be received thereby, means for `translating the slide for effecting a rotation of the work about its aXis through the frictional Contact of the work and the slide, means laterally engaging the work to prevent tilting or canting of the work in the work receiving groove and to take the thrust of the grinding wheel on the work, a second slide beneath the work rotation slide for supporting and translating the grinding wheel thrust members, and means for translating the second slide.

5. In a. grinding `machine for grinding and forming the terminal seat portion of tapered anti-friction rolls the combination of a grinding wheel, a support therefor, means rotatably supporting and actuating a series of work pieces tangentially of the grinding wheel including a fixed bar, a slide adjacent thereto and spaced therefrom forming a work receiving trough, means for effecting translation of the slide for actuating the work, and means for adjusting the angular relation between the grinding wheel and work groove for forming the terminal seat portion of the work.

,6. In a grinding machine for grinding the terminal seat portion of tapered anti-friction bearing rolls the combination of a grinding wheel, a support for the grinding wheel, a work receiving trough carried by the bed comprising a Xed side secured to the bed, a movable side journaled on the bed, the opposed sides of the trough conforming substantially to the work to be operated upon, and work blades within the trough laterally engaging the work to prevent canting of the work in the trough and to take the thrustI of the grinding wheel.

7. In a grinding machine for grinding the terminal seat portion of tapered anti-friction bearing rolls the combination of a grinding wheel, a support for the grinding wheel.,` a work receiving trough carried by the bed comprising a fixed side secured to the bed. a'movable side journaled on the bed, the opposed sides of the trough conforming substantially to the work to be operated upon, work blades within the trough laterally engaging the work to prevent canting of the work in the trough and to take the thrust of the grinding Wheel, means support-ing the work blades for movement in the direction of the movement of the work, and means for shifting the work and blades at differential speeds'to maintain a certain backing up pressure between the work and blades.

8. In a grinding machine for grinding the terminal portion of cylindrical articles comprising means for laterally frictionally engaging the articles and movable relative to the articles, means for actuating the laterally engaging means for rolling the articles at a pre-determined rate, a grinding wheel for operation on the terminal portion of the articles while being actuated, and additional lateral support means for engaging the work and movable relative thereto at a rate slightly in excess of the rate of movement of the article to exert a backing up pressure on the articles while being ground.

9. In a grinding machine for grinding the terminal portions of cylindrical articles, the combination of a grinding wheel, a work receiving trough adjacent the grinding wheel comprising a pair of opposed side members having their opposed faces conforming to the contour of the articles to be ground, a slide for one of the trough faces, means for translating said trough face relative to the remaining face, a second slide movable relative to the first slide, and means carried by the second slide projecting into the work receiving trough for laterally engaging the Worx therein to take the thrust of the grinding wheel.

Ilfl 5 l0. In a grinding machine for grinding the terminal portions of cylindrical articles, the combination of a grinding Wheel, a. Worl receivinfr trough adjacent the grinding Wheel comprising a pair oitl opposed side members having their opposed sides conto ming to the contour of the articles to be ground, a slide for one of the trough faces, means for translating said trough tace relative to the remaining tace, a second slide movable relative to the iirst slide, means carried by the second slide projecting into the Work receiving trough for laterally engaging the Work therein to take the thrust of the grinding Wheel, and a common actuating means for actuating the tivo slides at diierential rates whereby a pressure is maintained on the Work by the means projecting into the Work trough and engaging the Work.

ll. In a grinding machine for grinding the terminal portions of cylindrical articles, t-he combination of a grinding Wheel, a Work receiving trough adjacent the grinding Wheel comprising a pair of opposed side members having their opposed faces conforming to the contour of trie articles to be ground, a slide tor one of the trough faces, means tor ranslating said trough face relative to the remaining tace, a second slide movable relative to the lirst slide, means carried by the second slide projecting into the Work receiving trough for laterally engaging the Work therein to take the thrust of the grinding Wheel, a common actuating means for actuating the tWo slides at differential rates Whereby a pressure is maintained on the Work by the means projecting into the Work trough and engaging the work, said means comprising a rack on each slide, a gear for each rack, said gears each having a different number of teeth, and a common shaft for rotating the gears.

l2. In a grinding machine for grinding the terminal seat portion of anti-friction bearing rolls, the combination of a bed, a grinding Wheel rotatably carried thereby, a Work receiving trough adjacent the operative surface of the Wheel comprising a iixed side, a movable side, an ejector pin beneath each Work piece, and means for axially shitting the pin to eject the Work piece from the trough at the conclusion of the grinding operation.

13. In a grinding machine for grinding the terminal seat portion of tapered anti-friction bearing rolls the combination of a bed, a grinding Wheel carried thereby and rotatable in a horizontal plane, a Work receiving trough below the plane of the grinding Wheel and comprising means for rolling the Work on its periphery beloiv and in Contact with the grinding Wheel, means in the trough backing up the Work to take the thrust of the grinding Wheel thereon, a slide for said backing means, and means carried by said slide for ejecting the Work trom the grinding throat at the conclusion of the grinding operation.

14. In a grinding machine for grinding the terminal seat portion ot tapered antifriction bearing rolls the combination of a bed, a. grinding Wheel carried thereby and rotatable in a horizontal plane, a Work receiving trough belowr the plane of the grinding Wheel and comprising means for rolling the Work on its periphery below and in contact With the grinding' Wheel, means in the trough backing up the Work to take the thrust of the grinding Wheel thereon, a slide for said backing means, means carried by said slide for ej ecting the Work from the grinding throat at the conclusion of the grinding operation, said means comprising an ejector pin slidably carried by the slide at a point adjacent the backing up members, and a fixed cam in the path of movement of the slide and trough for axially shifting the pin and ejecting the Work.

In testimony whereof I affix my signature.

CLEMENT BOOTH. 

